diff --git a/src/lib.rs b/src/lib.rs
index c7e0285f..b8ce2e2a 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -32,13 +32,6 @@ fn swap16(x: u32) -> u32 {
     x.rotate_left(16)
 }
 
-// CYW_SPID command structure constants.
-const WRITE: bool = true;
-const READ: bool = false;
-const INC_ADDR: bool = true;
-#[allow(unused)]
-const FIXED_ADDR: bool = false;
-
 fn cmd_word(write: bool, incr: bool, func: u32, addr: u32, len: u32) -> u32 {
     (write as u32) << 31 | (incr as u32) << 30 | (func & 0b11) << 28 | (addr & 0x1FFFF) << 11 | (len & 0x7FF)
 }
@@ -48,104 +41,114 @@ fn slice8_mut(x: &mut [u32]) -> &mut [u8] {
     unsafe { slice::from_raw_parts_mut(x.as_mut_ptr() as _, len) }
 }
 
-const FUNC_BUS: u32 = 0;
-const FUNC_BACKPLANE: u32 = 1;
-const FUNC_WLAN: u32 = 2;
-const FUNC_BT: u32 = 3;
+mod constants {
+    #![allow(unused)]
+    pub(crate) const FUNC_BUS: u32 = 0;
+    pub(crate) const FUNC_BACKPLANE: u32 = 1;
+    pub(crate) const FUNC_WLAN: u32 = 2;
+    pub(crate) const FUNC_BT: u32 = 3;
 
-const REG_BUS_CTRL: u32 = 0x0;
-const REG_BUS_INTERRUPT: u32 = 0x04; // 16 bits - Interrupt status
-const REG_BUS_INTERRUPT_ENABLE: u32 = 0x06; // 16 bits - Interrupt mask
-const REG_BUS_STATUS: u32 = 0x8;
-const REG_BUS_TEST_RO: u32 = 0x14;
-const REG_BUS_TEST_RW: u32 = 0x18;
-const REG_BUS_RESP_DELAY: u32 = 0x1c;
-const WORD_LENGTH_32: u32 = 0x1;
-const HIGH_SPEED: u32 = 0x10;
+    pub(crate) const REG_BUS_CTRL: u32 = 0x0;
+    pub(crate) const REG_BUS_INTERRUPT: u32 = 0x04; // 16 bits - Interrupt status
+    pub(crate) const REG_BUS_INTERRUPT_ENABLE: u32 = 0x06; // 16 bits - Interrupt mask
+    pub(crate) const REG_BUS_STATUS: u32 = 0x8;
+    pub(crate) const REG_BUS_TEST_RO: u32 = 0x14;
+    pub(crate) const REG_BUS_TEST_RW: u32 = 0x18;
+    pub(crate) const REG_BUS_RESP_DELAY: u32 = 0x1c;
+    pub(crate) const WORD_LENGTH_32: u32 = 0x1;
+    pub(crate) const HIGH_SPEED: u32 = 0x10;
 
-// SPI_STATUS_REGISTER bits
-const STATUS_DATA_NOT_AVAILABLE: u32 = 0x00000001;
-const STATUS_UNDERFLOW: u32 = 0x00000002;
-const STATUS_OVERFLOW: u32 = 0x00000004;
-const STATUS_F2_INTR: u32 = 0x00000008;
-const STATUS_F3_INTR: u32 = 0x00000010;
-const STATUS_F2_RX_READY: u32 = 0x00000020;
-const STATUS_F3_RX_READY: u32 = 0x00000040;
-const STATUS_HOST_CMD_DATA_ERR: u32 = 0x00000080;
-const STATUS_F2_PKT_AVAILABLE: u32 = 0x00000100;
-const STATUS_F2_PKT_LEN_MASK: u32 = 0x000FFE00;
-const STATUS_F2_PKT_LEN_SHIFT: u32 = 9;
-const STATUS_F3_PKT_AVAILABLE: u32 = 0x00100000;
-const STATUS_F3_PKT_LEN_MASK: u32 = 0xFFE00000;
-const STATUS_F3_PKT_LEN_SHIFT: u32 = 21;
+    // SPI_STATUS_REGISTER bits
+    pub(crate) const STATUS_DATA_NOT_AVAILABLE: u32 = 0x00000001;
+    pub(crate) const STATUS_UNDERFLOW: u32 = 0x00000002;
+    pub(crate) const STATUS_OVERFLOW: u32 = 0x00000004;
+    pub(crate) const STATUS_F2_INTR: u32 = 0x00000008;
+    pub(crate) const STATUS_F3_INTR: u32 = 0x00000010;
+    pub(crate) const STATUS_F2_RX_READY: u32 = 0x00000020;
+    pub(crate) const STATUS_F3_RX_READY: u32 = 0x00000040;
+    pub(crate) const STATUS_HOST_CMD_DATA_ERR: u32 = 0x00000080;
+    pub(crate) const STATUS_F2_PKT_AVAILABLE: u32 = 0x00000100;
+    pub(crate) const STATUS_F2_PKT_LEN_MASK: u32 = 0x000FFE00;
+    pub(crate) const STATUS_F2_PKT_LEN_SHIFT: u32 = 9;
+    pub(crate) const STATUS_F3_PKT_AVAILABLE: u32 = 0x00100000;
+    pub(crate) const STATUS_F3_PKT_LEN_MASK: u32 = 0xFFE00000;
+    pub(crate) const STATUS_F3_PKT_LEN_SHIFT: u32 = 21;
 
-const REG_BACKPLANE_GPIO_SELECT: u32 = 0x10005;
-const REG_BACKPLANE_GPIO_OUTPUT: u32 = 0x10006;
-const REG_BACKPLANE_GPIO_ENABLE: u32 = 0x10007;
-const REG_BACKPLANE_FUNCTION2_WATERMARK: u32 = 0x10008;
-const REG_BACKPLANE_DEVICE_CONTROL: u32 = 0x10009;
-const REG_BACKPLANE_BACKPLANE_ADDRESS_LOW: u32 = 0x1000A;
-const REG_BACKPLANE_BACKPLANE_ADDRESS_MID: u32 = 0x1000B;
-const REG_BACKPLANE_BACKPLANE_ADDRESS_HIGH: u32 = 0x1000C;
-const REG_BACKPLANE_FRAME_CONTROL: u32 = 0x1000D;
-const REG_BACKPLANE_CHIP_CLOCK_CSR: u32 = 0x1000E;
-const REG_BACKPLANE_PULL_UP: u32 = 0x1000F;
-const REG_BACKPLANE_READ_FRAME_BC_LOW: u32 = 0x1001B;
-const REG_BACKPLANE_READ_FRAME_BC_HIGH: u32 = 0x1001C;
-const REG_BACKPLANE_WAKEUP_CTRL: u32 = 0x1001E;
-const REG_BACKPLANE_SLEEP_CSR: u32 = 0x1001F;
+    pub(crate) const REG_BACKPLANE_GPIO_SELECT: u32 = 0x10005;
+    pub(crate) const REG_BACKPLANE_GPIO_OUTPUT: u32 = 0x10006;
+    pub(crate) const REG_BACKPLANE_GPIO_ENABLE: u32 = 0x10007;
+    pub(crate) const REG_BACKPLANE_FUNCTION2_WATERMARK: u32 = 0x10008;
+    pub(crate) const REG_BACKPLANE_DEVICE_CONTROL: u32 = 0x10009;
+    pub(crate) const REG_BACKPLANE_BACKPLANE_ADDRESS_LOW: u32 = 0x1000A;
+    pub(crate) const REG_BACKPLANE_BACKPLANE_ADDRESS_MID: u32 = 0x1000B;
+    pub(crate) const REG_BACKPLANE_BACKPLANE_ADDRESS_HIGH: u32 = 0x1000C;
+    pub(crate) const REG_BACKPLANE_FRAME_CONTROL: u32 = 0x1000D;
+    pub(crate) const REG_BACKPLANE_CHIP_CLOCK_CSR: u32 = 0x1000E;
+    pub(crate) const REG_BACKPLANE_PULL_UP: u32 = 0x1000F;
+    pub(crate) const REG_BACKPLANE_READ_FRAME_BC_LOW: u32 = 0x1001B;
+    pub(crate) const REG_BACKPLANE_READ_FRAME_BC_HIGH: u32 = 0x1001C;
+    pub(crate) const REG_BACKPLANE_WAKEUP_CTRL: u32 = 0x1001E;
+    pub(crate) const REG_BACKPLANE_SLEEP_CSR: u32 = 0x1001F;
 
-const BACKPLANE_WINDOW_SIZE: usize = 0x8000;
-const BACKPLANE_ADDRESS_MASK: u32 = 0x7FFF;
-const BACKPLANE_ADDRESS_32BIT_FLAG: u32 = 0x08000;
-const BACKPLANE_MAX_TRANSFER_SIZE: usize = 64;
-// Active Low Power (ALP) clock constants
-const BACKPLANE_ALP_AVAIL_REQ: u8 = 0x08;
-const BACKPLANE_ALP_AVAIL: u8 = 0x40;
+    pub(crate) const BACKPLANE_WINDOW_SIZE: usize = 0x8000;
+    pub(crate) const BACKPLANE_ADDRESS_MASK: u32 = 0x7FFF;
+    pub(crate) const BACKPLANE_ADDRESS_32BIT_FLAG: u32 = 0x08000;
+    pub(crate) const BACKPLANE_MAX_TRANSFER_SIZE: usize = 64;
+    // Active Low Power (ALP) clock constants
+    pub(crate) const BACKPLANE_ALP_AVAIL_REQ: u8 = 0x08;
+    pub(crate) const BACKPLANE_ALP_AVAIL: u8 = 0x40;
 
-// Broadcom AMBA (Advanced Microcontroller Bus Architecture) Interconnect (AI)
-// constants
-const AI_IOCTRL_OFFSET: u32 = 0x408;
-const AI_IOCTRL_BIT_FGC: u8 = 0x0002;
-const AI_IOCTRL_BIT_CLOCK_EN: u8 = 0x0001;
-const AI_IOCTRL_BIT_CPUHALT: u8 = 0x0020;
+    // Broadcom AMBA (Advanced Microcontroller Bus Architecture) Interconnect
+    // (AI) pub (crate) constants
+    pub(crate) const AI_IOCTRL_OFFSET: u32 = 0x408;
+    pub(crate) const AI_IOCTRL_BIT_FGC: u8 = 0x0002;
+    pub(crate) const AI_IOCTRL_BIT_CLOCK_EN: u8 = 0x0001;
+    pub(crate) const AI_IOCTRL_BIT_CPUHALT: u8 = 0x0020;
 
-const AI_RESETCTRL_OFFSET: u32 = 0x800;
-const AI_RESETCTRL_BIT_RESET: u8 = 1;
+    pub(crate) const AI_RESETCTRL_OFFSET: u32 = 0x800;
+    pub(crate) const AI_RESETCTRL_BIT_RESET: u8 = 1;
 
-const AI_RESETSTATUS_OFFSET: u32 = 0x804;
+    pub(crate) const AI_RESETSTATUS_OFFSET: u32 = 0x804;
 
-const TEST_PATTERN: u32 = 0x12345678;
-const FEEDBEAD: u32 = 0xFEEDBEAD;
+    pub(crate) const TEST_PATTERN: u32 = 0x12345678;
+    pub(crate) const FEEDBEAD: u32 = 0xFEEDBEAD;
 
-// SPI_INTERRUPT_REGISTER and SPI_INTERRUPT_ENABLE_REGISTER Bits
-const IRQ_DATA_UNAVAILABLE: u16 = 0x0001; // Requested data not available; Clear by writing a "1"
-const IRQ_F2_F3_FIFO_RD_UNDERFLOW: u16 = 0x0002;
-const IRQ_F2_F3_FIFO_WR_OVERFLOW: u16 = 0x0004;
-const IRQ_COMMAND_ERROR: u16 = 0x0008; // Cleared by writing 1
-const IRQ_DATA_ERROR: u16 = 0x0010; // Cleared by writing 1
-const IRQ_F2_PACKET_AVAILABLE: u16 = 0x0020;
-const IRQ_F3_PACKET_AVAILABLE: u16 = 0x0040;
-const IRQ_F1_OVERFLOW: u16 = 0x0080; // Due to last write. Bkplane has pending write requests
-const IRQ_MISC_INTR0: u16 = 0x0100;
-const IRQ_MISC_INTR1: u16 = 0x0200;
-const IRQ_MISC_INTR2: u16 = 0x0400;
-const IRQ_MISC_INTR3: u16 = 0x0800;
-const IRQ_MISC_INTR4: u16 = 0x1000;
-const IRQ_F1_INTR: u16 = 0x2000;
-const IRQ_F2_INTR: u16 = 0x4000;
-const IRQ_F3_INTR: u16 = 0x8000;
+    // SPI_INTERRUPT_REGISTER and SPI_INTERRUPT_ENABLE_REGISTER Bits
+    pub(crate) const IRQ_DATA_UNAVAILABLE: u16 = 0x0001; // Requested data not available; Clear by writing a "1"
+    pub(crate) const IRQ_F2_F3_FIFO_RD_UNDERFLOW: u16 = 0x0002;
+    pub(crate) const IRQ_F2_F3_FIFO_WR_OVERFLOW: u16 = 0x0004;
+    pub(crate) const IRQ_COMMAND_ERROR: u16 = 0x0008; // Cleared by writing 1
+    pub(crate) const IRQ_DATA_ERROR: u16 = 0x0010; // Cleared by writing 1
+    pub(crate) const IRQ_F2_PACKET_AVAILABLE: u16 = 0x0020;
+    pub(crate) const IRQ_F3_PACKET_AVAILABLE: u16 = 0x0040;
+    pub(crate) const IRQ_F1_OVERFLOW: u16 = 0x0080; // Due to last write. Bkplane has pending write requests
+    pub(crate) const IRQ_MISC_INTR0: u16 = 0x0100;
+    pub(crate) const IRQ_MISC_INTR1: u16 = 0x0200;
+    pub(crate) const IRQ_MISC_INTR2: u16 = 0x0400;
+    pub(crate) const IRQ_MISC_INTR3: u16 = 0x0800;
+    pub(crate) const IRQ_MISC_INTR4: u16 = 0x1000;
+    pub(crate) const IRQ_F1_INTR: u16 = 0x2000;
+    pub(crate) const IRQ_F2_INTR: u16 = 0x4000;
+    pub(crate) const IRQ_F3_INTR: u16 = 0x8000;
 
-const IOCTL_CMD_UP: u32 = 2;
-const IOCTL_CMD_SET_SSID: u32 = 26;
-const IOCTL_CMD_ANTDIV: u32 = 64;
-const IOCTL_CMD_SET_VAR: u32 = 263;
-const IOCTL_CMD_GET_VAR: u32 = 262;
-const IOCTL_CMD_SET_PASSPHRASE: u32 = 268;
+    pub(crate) const IOCTL_CMD_UP: u32 = 2;
+    pub(crate) const IOCTL_CMD_SET_SSID: u32 = 26;
+    pub(crate) const IOCTL_CMD_ANTDIV: u32 = 64;
+    pub(crate) const IOCTL_CMD_SET_VAR: u32 = 263;
+    pub(crate) const IOCTL_CMD_GET_VAR: u32 = 262;
+    pub(crate) const IOCTL_CMD_SET_PASSPHRASE: u32 = 268;
 
-const CHANNEL_TYPE_CONTROL: u8 = 0;
-const CHANNEL_TYPE_EVENT: u8 = 1;
-const CHANNEL_TYPE_DATA: u8 = 2;
+    pub(crate) const CHANNEL_TYPE_CONTROL: u8 = 0;
+    pub(crate) const CHANNEL_TYPE_EVENT: u8 = 1;
+    pub(crate) const CHANNEL_TYPE_DATA: u8 = 2;
+
+    // CYW_SPID command structure constants.
+    pub(crate) const WRITE: bool = true;
+    pub(crate) const READ: bool = false;
+    pub(crate) const INC_ADDR: bool = true;
+    pub(crate) const FIXED_ADDR: bool = false;
+}
+use crate::constants::*;
 
 #[derive(Clone, Copy)]
 pub enum IoctlType {
@@ -153,6 +156,7 @@ pub enum IoctlType {
     Set = 2,
 }
 
+#[allow(unused)]
 #[derive(Clone, Copy, PartialEq, Eq)]
 enum Core {
     WLAN = 0,
@@ -170,6 +174,7 @@ impl Core {
     }
 }
 
+#[allow(unused)]
 struct Chip {
     arm_core_base_address: u32,
     socsram_base_address: u32,
@@ -1077,6 +1082,7 @@ where
         true
     }
 
+    #[allow(unused)]
     async fn bp_read(&mut self, mut addr: u32, mut data: &mut [u32]) {
         // It seems the HW force-aligns the addr
         // to 2 if data.len() >= 2
@@ -1170,10 +1176,12 @@ where
         self.backplane_readn(addr, 2).await as u16
     }
 
+    #[allow(unused)]
     async fn bp_write16(&mut self, addr: u32, val: u16) {
         self.backplane_writen(addr, val as u32, 2).await
     }
 
+    #[allow(unused)]
     async fn bp_read32(&mut self, addr: u32) -> u32 {
         self.backplane_readn(addr, 4).await
     }
@@ -1244,6 +1252,7 @@ where
         self.readn(func, addr, 2).await as u16
     }
 
+    #[allow(unused)]
     async fn write16(&mut self, func: u32, addr: u32, val: u16) {
         self.writen(func, addr, val as u32, 2).await
     }
@@ -1252,6 +1261,7 @@ where
         self.readn(func, addr, 4).await
     }
 
+    #[allow(unused)]
     async fn write32(&mut self, func: u32, addr: u32, val: u32) {
         self.writen(func, addr, val, 4).await
     }
diff --git a/src/structs.rs b/src/structs.rs
index 35547097..ed5fc18d 100644
--- a/src/structs.rs
+++ b/src/structs.rs
@@ -5,10 +5,12 @@ macro_rules! impl_bytes {
         impl $t {
             pub const SIZE: usize = core::mem::size_of::<Self>();
 
+            #[allow(unused)]
             pub fn to_bytes(&self) -> [u8; Self::SIZE] {
                 unsafe { core::mem::transmute(*self) }
             }
 
+            #[allow(unused)]
             pub fn from_bytes(bytes: &[u8; Self::SIZE]) -> Self {
                 unsafe { core::mem::transmute(*bytes) }
             }
@@ -167,6 +169,7 @@ pub struct DownloadHeader {
 }
 impl_bytes!(DownloadHeader);
 
+#[allow(unused)]
 pub const DOWNLOAD_FLAG_NO_CRC: u16 = 0x0001;
 pub const DOWNLOAD_FLAG_BEGIN: u16 = 0x0002;
 pub const DOWNLOAD_FLAG_END: u16 = 0x0004;